U.S. patent number 7,397,603 [Application Number 11/381,895] was granted by the patent office on 2008-07-08 for deployable projection screen.
This patent grant is currently assigned to Infocus Corporation. Invention is credited to William L. Emery, Jason Kuhn, Mark D. Peterson.
United States Patent |
7,397,603 |
Peterson , et al. |
July 8, 2008 |
**Please see images for:
( Certificate of Correction ) ** |
Deployable projection screen
Abstract
Embodiments of apparatuses, methods and systems for deployable
projection screens are generally described herein. Other
embodiments may be described and claimed.
Inventors: |
Peterson; Mark D. (Lake
Oswsego, OR), Emery; William L. (Sherwood, OR), Kuhn;
Jason (Hillsboro, OR) |
Assignee: |
Infocus Corporation
(Wilsonville, OR)
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Family
ID: |
37393784 |
Appl.
No.: |
11/381,895 |
Filed: |
May 5, 2006 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20060250692 A1 |
Nov 9, 2006 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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60678635 |
May 5, 2005 |
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Current U.S.
Class: |
359/443; 160/354;
359/461; 359/896; 359/900 |
Current CPC
Class: |
G03B
21/10 (20130101); G03B 21/58 (20130101); Y10S
359/90 (20130101) |
Current International
Class: |
G03B
21/56 (20060101); A47H 23/00 (20060101); G02B
7/00 (20060101) |
Field of
Search: |
;359/443,461,446,896,900
;160/354 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Open Air Cinema, "Inflatable Outdoor Movie Screens," internet
article, retrieved Aug. 30, 2006,
www.summercinema.com/screensales.html. cited by other .
Signweb, "Inflatable Screens, Boards," internet article, retrieved
Aug. 30, 2006, www. signweb.com/design/rods/blimp;sign.html. cited
by other .
Da-lite, "Tensioned Contour Electrol," internet article, retrieved
Aug. 30, 2006,
www.dalite.com/products/product.php?cID-29&pID-289. cited by
other .
Draper, "Premier Motorized Screen with Tab Tensioning System,"
internet article, retrieved Aug. 30, 2006,
www.draperinc.com/images/2005Catalogs/ScreenSweets/Premier. cited
by other .
Photography-Lighting.Com, "Photography light reflectros and
lighting reflector kit page," internet catalog, retrieved Aug. 30,
2006, www.photography-lighting.com/reflectros.htm. cited by
other.
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Primary Examiner: Lee; Diane I.
Assistant Examiner: Cruz; Magda
Attorney, Agent or Firm: Schwabe Williamson Wyatt
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
The present application claims priority to U.S. Provisional
Application No. 60/678,635, filed May 5, 2005, entitled "PROJECTION
SCREENS," the entire contents of which is hereby incorporated by
reference.
Claims
What is claimed is:
1. A projection screen comprising: screen material having a
perimeter and optical attributes suitable to facilitate viewing of
images projected thereon; and a flexible frame having an axis
dividing the flexible flame into a first and second portion, the
flexible frame attached to the screen material substantially at
said perimeter to support the screen material when the projection
screen is in an expanded projection state, and the flexible frame
being further sufficiently flexible to allow the projection screen
to be twisted into a contracted storage state when transition
forces are applied at a plurality of perimeter points, the
projection screen in the contracted storage state occupying a
surface area no more than 50% of a surface area occupied by the
projection screen in the expanded projection state, the transition
forces including two rotational forces applied to the first
portion, the two rotational forces being applied in opposite
directions about the axis.
2. The projection screen of claim 1, wherein the projection screen
further comprises: a mechanical actuator coupled to the flexible
frame and configured to provide the transition forces.
3. The projection screen of claim 2, further comprising: a first
anchor coupled to the flexible frame at a first end on the axis,
the first anchor divided by the axis into a first and second part,
with the first part of the first anchor coupled to the flexible
frame in the first portion and the second part of the first anchor
coupled to the flexible frame in the second portion, a first
rotational force of the two rotational forces applied to the first
portion through the first part of the first anchor; and a second
anchor coupled to the flexible frame at a second end on the axis,
substantially opposite the first end, the second anchor divided by
the axis into a first and second part, with the first part of the
second anchor coupled to the flexible frame in the first portion
and the second part of the second anchor coupled to the flexible
frame in the second portion, a second rotational force of the two
rotational forces applied to the first portion through the first
part of the second anchor.
4. The projection screen of claim 3, wherein the mechanical
actuator further comprises: a rotating mechanism coupled to the
first anchor and configured to contribute a rotational force to the
transitional forces.
5. The projection screen of claim 4, wherein the mechanical
actuator further comprises: a first support coupled to the rotating
mechanism; and a second support coupled to the second anchor; and
the mechanical actuator configured to contribute a compressive
force to the transitional forces by moving the first and second
supports relative to one another.
6. The projection screen of claim 1, wherein the projection screen
in the expanded projection state comprises a substantially
elliptical, circular or rectangular aspect.
7. The projection screen of claim 1, wherein the flexible frame is
configured to be folded over onto itself one or more times when the
projection screen is in the contracted storage state.
8. A system comprising: a projection screen including screen
material having a perimeter and optical attributes suitable to
facilitate viewing of images projected thereon; and a flexible
frame having an axis dividing the flexible flame into a first and
second portion, the flexible frame attached to the screen material
substantially at said perimeter to support the screen material when
the projection screen is in an expanded projection state, and the
flexible frame being further sufficiently flexible to allow the
projection screen to be twisted into a contracted storage state
when transition forces are applied at a plurality of perimeter
points, the transition forces including two rotational forces
applied to the first portion, the two rotational forces being
applied in opposite directions about the axis; and a housing
configured to house a projection device, to store the projection
screen when in the contracted storage state, and to display the
projection screen when in the expanded projection state in a manner
to facilitate viewing of an image projected by the projection
device.
9. The system of claim 8, further comprising: a mechanical actuator
configured to provide transitional forces to facilitate transition
of the projection screen between the expanded projection state and
the contracted storage state.
10. The system of claim 8, wherein the projection screen comprises:
the projection screen in the contracted storage state occupying a
surface area no more than 50% of a surface area occupied by the
projection screen in the expanded projection state.
11. The system of claim 8, wherein the projection screen comprises:
first and second supports; and screen material coupled to the first
and second supports.
12. A method comprising: untwisting a projection screen from a
contracted storage state to an expanded projection state by
applying transition forces to a plurality of perimeter points of a
flexible frame of the projection screen, the flexible frame having
an axis dividing the flexible flame into a first and second
portion, screen material, having optical attributes suitable to
facilitate viewing of images projected thereon, attached to the
flexible frame substantially at a perimeter of the screen material;
applying transition forces including applying two rotational forces
to the first portion, the two rotational forces being applied to
opposite directions about the axis; and projecting, with a
projecting device, an image onto the projection screen while the
projection screen is in the expanded projection state.
13. The method of claim 12, wherein said applying of transitional
forces includes: applying at least one force chosen from a
compressive force or a retractive force to the plurality of
perimeter points.
14. The method of claim 12, further comprising: operating the
projection device from within a projector cavity of a housing.
15. The method of claim 14, wherein said untwisting of the
projection screen is done automatically.
Description
FIELD
Disclosed embodiments of the present invention relate to the field
of projection systems, and more particularly to the use of a
deployable projection screen in such systems.
BACKGROUND
Projection systems project images from a small display, or light
valve, found in a projection device, onto a viewing surface.
Although the viewing surface may be any flat surface, using a
projection screen as the viewing surface may facilitate reflection
of the projected image with detail and contrast suitable for
viewing over a wide range of angles. A high-quality projection
screen will typically reject a substantial portion of the ambient
light surrounding the projection system, while still providing
sufficient viewing angles of the projected image.
The images projected by projection systems are capable of being
very large, which, in turn, corresponds to the use of a large
projection screen. However, some users may find a large projection
screen distracting while not in use.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are illustrated by way of example and
not by way of limitation in the figures of the accompanying
drawings, in which the like references indicate similar elements
and in which:
FIGS. 1a-1c illustrate perspective views of a projection system in
accordance with an embodiment of the present invention;
FIGS. 2a-2c illustrate a side view of a foldable projection screen
transferring between a stored state and a deployed state, in
accordance with an embodiment of the present invention;
FIG. 3 illustrates a side view of a joint between two adjacent
slats of a foldable projection screen, in accordance with an
embodiment of the present invention;
FIG. 4 illustrates a front view of a projection screen having an
inflatable frame, in accordance with an embodiment of the present
invention;
FIG. 5 illustrates a cross-sectional view of the projection screen
of FIG. 4, in accordance with an embodiment of the present
invention;
FIGS. 6a-6b illustrate front views of a tensioned projection screen
in various stages, in accordance with an embodiment of the present
invention;
FIGS. 7a-7b illustrate a front view of a projection screen with
telescopic frame segments in deployed and stored states, in
accordance with an embodiment of the present invention;
FIG. 8 illustrates a front view of a projection screen using
variable-tensioned segmented rollers, in accordance with an
embodiment of the present invention;
FIG. 9 illustrates a front view of a projection screen using
shape-segmented rollers, in accordance with an embodiment of the
present invention;
FIGS. 10a-10e illustrate various views of a flexible frame
projection screen in various stages of deployment, in accordance
with an embodiment of the present invention; and
FIG. 11 illustrates a flexible frame projection screen, in
accordance with an embodiment of the present invention.
DETAILED DESCRIPTION
In the following detailed description reference is made to the
accompanying drawings that form a part hereof, wherein like
numerals designate like parts throughout, and in which is shown, by
way of illustration, specific embodiments in which the invention
may be practiced. It is to be understood that other embodiments may
be utilized and structural or logical changes may be made without
departing from the scope of the embodiments of the present
invention. Directions such as up, down, back, and front may be used
in the discussion of the drawings. These directions are used to
facilitate the discussion and are not intended to restrict the
application of embodiments of this invention. Therefore, the
following detailed description is not to be taken in a limiting
sense.
Further, various operations will be described as multiple discrete
operations, in turn, in a manner that is most helpful in
understanding the present invention; however, the order of
description should not be construed as to imply that these
operations are necessarily order dependent. In particular, these
operations need not be performed in the order of presentation.
The phrase "in one embodiment" is used repeatedly. The phrase
generally does not refer to the same embodiment; however, it may.
The terms "comprising," "having," and "including" are synonymous,
unless the context dictates otherwise.
In providing some clarifying context to language that may be used
in connection with various embodiments, the phrase "A/B" means "A
or B." The phrase "A and/or B" means "(A), (B), or (A and B)." The
phrase "at least one of A, B and C" means "(A), (B), (C), (A and
B), (A and C), (B and C) or (A, B and C)." The phrase "(A)B" means
"(B) or (A and B)," that is, A is optional.
Various embodiments of the present invention include projection
screens designed to be flat in a deployed state, yet disappear into
a structure while in a stored state. Embodiments described and
discussed below may be employed in front- and/or rear-projection
systems.
FIG. 1a illustrates a perspective view of a projection system 100
including a housing 104 containing a projection device 108, in
accordance with an embodiment of the present invention. The housing
104 may be a piece of furniture, e.g., a coffee table. In one
embodiment the projection device 108 may be recessed within a
projector cavity of the housing 104 and covered with a transparent
or a removable cover. During use, the projection device 108 may
operate from within the projector cavity, or it may be extended
outward by a certain amount.
Deployment of a projection screen 112 is shown in an intermediate
state in FIG. 1b in accordance with an embodiment of the present
invention. The projection screen 112 may include rollers 116 and
screen material 120. The screen material 120 may have optical
attributes suitable to at least facilitate viewing of an image
projected thereon. These optical attributes may include, for
example, gain, contrast (e.g., ambient light rejection),
resolution, uniformity, projection format, etc.
Furthermore, the projection screen 112 may have physical attributes
suitable to facilitate repeated transitions between contracted
storage (or "stored") state and an expanded projection (or
"deployed") state without materially affecting optical attributes
of the screen material. The physical attributes may include, for
example, flexibility, noncreasing, pliability, etc.
Values of these attributes (both physical and optical) may be
provided with respect to design constraints and/or objectives of a
particular embodiment.
The rollers 116 may unroll the screen material 120 into the
deployed state depicted in FIG. 1c. A frame (not shown) may be
coupled to the rollers 116 to facilitate the deployment and support
of the projection screen 112. The frame may be automatic or
manually operated. In one embodiment, the frame may include a
scissor-jack design.
With the projection screen 112 fully deployed, the projection
device 108 may project an image for viewing. In various
embodiments, the projection screen 112 and/or the projection device
108 may be adapted to accommodate the relative positioning of the
two components. For example, the projection device 108 may be a
steep-angled projection device to accommodate for the relative
closeness of the two components.
In an embodiment the relative positioning of the projection device
108 and the projection screen 112 may be adjusted to, e.g., provide
for a larger/smaller projected image. The adjustment of the
relative positioning may be done by moving the projection screen
112 and/or the projection device 108.
In an embodiment, a second projection screen (not shown) may be
adapted to be deployed at a second distance from the projection
device 108 to accommodate a different image size than the
projection screen 112. In this embodiment, a user may view a
smaller image, e.g., for watching a television program, on the
projection screen 112, or a larger image on the second screen,
e.g., for watching a video in a wide-screen display format, that is
further from the projection device 108.
FIG. 2a illustrates a side view of a foldable projection screen 200
stored within a housing 204, in accordance with an embodiment of
the present invention. The projection screen 200 and housing 204
may be substantially interchangeable with the like-named elements
discussed above with reference to the projection system 100.
In this embodiment, the projection screen 200 may include slats
208. The slats 208 may provide a supportive substrate for the
projection screen material disposed on one side of the slats 208.
Each of the slats 208 may be coupled to an adjacent slat 208 by a
hinge 212 at the edge. In one embodiment the type of hinge used may
have two pivot points so that it may fold in both directions.
In one embodiment, the projection screen 200 may have one or more
bi-stable springs designed to facilitate the transition of the
projection screen from the stored state depicted in FIG. 2a,
through an intermediate state depicted in FIG. 2b, to the deployed
state depicted in FIG. 2c, and back. In various embodiments, the
spring(s) may be embedded within the slats 208 or placed on the
backside of the screen (backside being the side opposite the
viewing side).
In one embodiment, the screen material may be loosely coupled to
the slats 208. For example, in one embodiment, the screen material
may be coupled to the top edge of the top slat 208 and the bottom
edge of the bottom slat 208. When the projection screen 200 is
deployed, the screen material may be stretched taut across one side
of the slats 208. In other embodiments, the screen material may be
coupled more closely to the slats 208, e.g., directly adhered to at
least a portion of the face of the slats 208.
In one embodiment, e.g., the embodiment depicted in FIG. 3, the
adjoining edges of slats 300, which may be substantially
interchangeable with slats 208, may be geometrically designed to
reduce the spacing at a junction 304 between adjacent slats 300
viewed from the front while they are in the deployed state. So
designed, the surface of adjoining slats may be substantially flush
with one another giving the appearance of a substantially
continuous viewing surface. In this embodiment, the slats 300 are
angled to pinch together at the junction 304.
FIG. 4 illustrates a front view of a projection screen 400 having
an inflatable frame 404, in accordance with an embodiment of the
present invention.
The frame 404 may be coupled to a mechanical actuator, e.g., a pump
408. In an embodiment, the pump 408 may be a high volume low
pressure (HVLP) pump. As the pump 408 is activated, the frame 404
may fill with air and provide a sufficiently rigid structure. The
projection screen material 412, which may be adhered to the frame
404, may become suitably taut upon inflation of the frame 404.
In an embodiment, the deployed projection screen 400 may have a
form factor suitable for indoor viewing. For example, the
projection screen 400 may be used interchangeably with the
projection screen 112 in the projection system 100. In this
embodiment, the pump 408 may operate from a storage location in the
housing 104.
Storage of the projection screen 400 may take place by deflating
the frame 404 and storing the projection screen material 412 within
a screen cavity of a housing.
FIG. 5 illustrates a cross-sectional view of the projection screen
of FIG. 4, in accordance with an embodiment of the present
invention. In this embodiment, the projection screen material 412
may be folded over the frame 404.
FIG. 6 illustrates a front view of a tensioned projection screen
600, in accordance with an embodiment of the present invention. In
this embodiment, a storage structure 602 may store screen material
608. Supporting features, such as cables 604, may extend
substantially orthogonal to the storage structure 602. The cables
604 may also be stored in the storage structure 602 and may be
retractably deployed by a constant-force spring, for example. In
other embodiments, the cables 604 may be semipermanently disposed.
In various embodiments, the cables 604 may be coupled to, or
independent from, the storage structure 602.
In one embodiment, the screen material 608 may be coupled to the
cables 604. More particularly, grommets 612 may be coupled to the
cables 604 and attachment points, e.g., eyelets 616, found on a
perimeter of the screen material 608. While eyelets 616 are shown
on two edges of the screen material 608, other embodiments may
additionally/alternatively have them elsewhere.
FIG. 6b illustrates an embodiment where the screen material 608 may
be pulled completely out of the storage structure 602 so that the
perimeter of the screen material 608 may be exposed in its
entirety. Suspension of the screen material 608 may cause the
appearance of a floating screen.
In an embodiment, the screen material 608 may include a border 620
surrounding a viewing area 624. The viewing area 624 may have
optical attributes suitable to facilitate viewing of images
projected thereon. The border 620 may have optical attributes
suitable to provide contrast to the viewing area 624, e.g., a black
matte to absorb light. Borders, similar to border 620, may be
applied to any other projection screen discussed herein.
Suspension of the screen material 608 may also facilitate
positioning of the viewing area 624 and/or concealment of the
storage structure 602. For example, the storage structure 602 may
be disposed in/at a high ceiling and the screen material 608 may be
pulled down, along the cables 604, to the desired location.
In various embodiments, the screen material 608 may include a top
perimeter edge having one or more grommets/attachment points
similar to the side edges. This may facilitate storage and/or
vertical tensioning of the screen material 608. In other
embodiments, other mechanical features may be
additionally/alternatively employed to facilitate storage and/or
vertical tensioning of the screen material 608
While the above embodiment illustrates the projection screen 600
being deployed by the screen material 608 being pulled down from
the storage structure 602, in other embodiments, the projection
screen 600 may be deployed by the screen material 608 being pulled
up or sideways out of the storage structure 602.
FIG. 7a illustrates a rear view of a projection screen 700 with
telescopic frame segments 704 in a stored state, in accordance with
an embodiment of the present invention. In the stored state, a
storage structure 708 may house screen material 712 and the frame
segments 704 may be collapsibly disposed within one another. In the
deployed state depicted in FIG. 7b, the frame segments 704 may be
extended, along with the screen material 712. Braces 716 may be
positioned between the frame segments 704 to facilitate crosswise
support.
FIG. 8 illustrates a front view of a projection screen 800 using
variable-tensioned segmented rollers 804, in accordance with an
embodiment of the present invention. In this embodiment, screen
material 808 may be coupled to the segmented rollers 804 and a
cross-bar 812. This embodiment may facilitate the application of
different quantities of tension across the face of the screen 800.
For example, in one embodiment, in order to flatten the edges, the
rollers 804 toward the outside may provide a greater tension than
the rollers 804 toward the middle. The tension applied by the
rollers 804 may be countered by the weight of the cross-bar 812 or
by coupling the cross-bar 812 to a structure.
In various embodiments, the rollers 804 may be disposed within a
housing (not shown).
FIG. 9 illustrates a front view of a projection screen 900 using
shaped-segmented rollers 904, in accordance with an embodiment of
the present invention. In this embodiment, a screen material 908
may be coupled to the rollers 904 and a cross-bar 912. The shape of
some of the rollers 904, e.g., the trapezoidal shape of the outer
rollers 904, may facilitate the provision of both a vertical force
and a horizontal force. The combination of the vertical and
horizontal forces may facilitate even tension across the face of
the projection screen 900. In one embodiment, the cross-bar 912 may
be curved in order to complement this tension. In this embodiment,
the curvature of the cross-bar 912 may be within a border
section.
Those skilled in the art will recognize that the trapezoidal shape
of the outer rollers 904 is as depicted in the plan view
illustrated in FIG. 9. The actual three-dimensional geometrical
shape may be, e.g., a conical portion having a diameter that
increases with an increased distance from a vertical centerline of
the projection screen 900.
FIGS. 10a-10e illustrate a flexible frame projection screen 1000 in
a deployed state, transitional states, and a stored state,
respectively, in accordance with an embodiment of the present
invention. The projection screen 1000 may have a frame 1004 with
screen material 1008 attached to it, substantially at the perimeter
of the screen material 1008. The frame 1004 may be constructed of a
material, e.g., spring steel, which is sufficiently flexible to
allow the projection screen 1000 to be repeatedly transitioned
between deployed and stored states through a combination of
bending, twisting, rotating, folding, etc.
In an embodiment, the frame 1004 may be sufficiently flexible to
allow the projection screen 1000 to transition from the deployed
state, illustrated in FIG. 10a, to the stored state, illustrated in
FIG. 10d, and vice versa. In an embodiment, transition of the
projection screen 1000 from the deployed state to the stored state
may be initiated by a combination of transitional forces, e.g.,
compressive forces 1012 and rotational forces 1016, being applied
to a plurality of perimeter points of the frame 1004.
FIGS. 10b-10c illustrate transitional states of the projection
screen 1000 in accordance with an embodiment of the invention. The
bending and compressing of the frame 1004 may release tension of
the screen material 1008. In this embodiment, a perimeter point
1020 may then be folded inside of perimeter point 1024. Similarly,
perimeter point 1028 may be folded inside of perimeter point
1032.
FIGS. 10d-10e respectively illustrate a side view and a front view
of the projection screen 1000 in the stored state in accordance
with embodiments of this invention. In this embodiment, the
projection screen 1000 has been folded over onto itself
approximately three times. Accordingly, the surface area that the
projection screen 1000 occupies while in the stored state may be
approximately one-ninth of the surface area that the projection
screen 1000 occupies while in the deployed state. In other
embodiments, the projection screen 1000 may be folded in a
different manner resulting in other surface area reductions.
Various embodiments of the present invention may include a surface
area of the stored state being no more than 50% of the surface area
of the deployed state.
The projection screen 1000 may be transitioned from the stored
state to the deployed state in a reverse manner with substantially
equal and opposite transition forces applied. As used herein a
compressive force may be positive or negative in order to compress
or expand the frame 1004, respectively. Similarly, as used herein a
retractive force may be positive or negative in order to retract or
extract the frame 1004, respectively.
While the projection screen 1000 in the deployed state is shown
with a circular aspect from the front view, other embodiments may
include deployed state aspects other than circular, e.g.,
substantially rectangular or elliptical. For example, FIG. 11
illustrates a projection screen 1100 having a substantially
elliptical deployed aspect from the front view, in accordance with
an embodiment of this invention.
In this embodiment, the projection screen 1100 may have a flexible
frame 1104, which may be similar to frame 1004 described above. The
projection screen 1100 may also include screen material 1108
attached to the frame 1104 at, or near, the perimeter of the screen
material 1108. The screen material 1108 may include a border 1112
similar to the border discussed and described above.
In this embodiment, the frame 1104 may be divided into a first
portion and a second portion by an axis 1154 having ends. In this
embodiment, the projection screen 1100 may also include a
mechanical actuator 1116 coupled to the frame 1104 at anchors 1120
and 1124 located at perimeter points of the frame 1104. The
mechanical actuator 1116 may be capable of transitioning the
projection screen 1100 between a deployed and stored state in a
manner similar to the transitioning of the projection screen 1000
shown and described above. In this embodiment, the mechanical
actuator 1116 may provide a combination of compressive forces 1128
and rotational forces 1132 upon the frame 1104 to transition the
projection screen 1100 from the deployed state to the stored state.
The mechanical actuator 1116 may provide rotational forces 1132 by
rotating mechanisms 1136 and 1140 coupled to respective anchors
1120 and 1124. The mechanical actuator 1116 may provide the
compressive forces 1128 by moving supports 1144 and 1148 toward one
another. The supports 1144 and 1148 may be on a track (not shown)
located within a storage device.
The mechanical actuator 1116 may also provide retractive forces
1152 via the supports 1144 and 1148. For example, in an embodiment
using the projection screen 1100 within the system 100 shown and
described in FIG. 1, the mechanical actuator 1116 may fold the
frame 1104 (by applying compressive forces 1128 and rotational
forces 1132) over onto itself and then retract the projection
screen 1100 within the housing 104 (by applying retractive forces
1152).
In various embodiments, the mechanical actuator 1116 may provide
transitional forces in other manners. Furthermore, in various
embodiments the mechanical actuator 1116 may be automatically or
manually operated.
In various embodiments, the projection screens 400, 600, 700, 800,
900, 1000, and/or 1100 may be used interchangeably with the
projection screen 112 within the projection system 100.
Although specific embodiments have been illustrated and described
herein for purposes of description of the preferred embodiment, it
will be appreciated by those of ordinary skill in the art that a
wide variety of alternate and/or equivalent implementations
calculated to achieve the same purposes may be substituted for the
specific embodiment shown and described without departing from the
scope of the present invention. Those with skill in the art will
readily appreciate that the present invention may be implemented in
a very wide variety of embodiments. This application is intended to
cover any adaptations or variations of the embodiments discussed
herein. Therefore, it is manifestly intended that this invention be
limited only by the claims and the equivalents thereof.
* * * * *
References